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Accessing Session from an HttpHandler
travislaborde
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7-30-2007 8:29 AM
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tags:
programming
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asp.net
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httphandler
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7-30-2007
3:46 PM
BitDrifter
Great clips, thanks.
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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/e0f9d960-2e8f-47d2-9770-dd8fd2af2084/172DF021-80C0-48C9-B900-665C9D70F080/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://aspadvice.com/blogs/ssmith/archive/2007/07/29/accessing-session-from-an-httphandler.aspx" href="http://aspadvice.com/blogs/ssmith/archive/2007/07/29/accessing-session-from-an-httphandler.aspx" style="font-size: 11px;">aspadvice.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://aspadvice.com/blogs/ssmith/archive/2007/07/29/accessing-session-from-an-httphandler.aspx"><H2>Accessing Session from an HttpHandler</H2></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://aspadvice.com/blogs/ssmith/archive/2007/07/29/accessing-session-from-an-httphandler.aspx"><P>I've run into this before but forgotten about it. I wrote an HttpHandler recently and was trying to access the Session object from the passed in HttpContext context object with </P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://aspadvice.com/blogs/ssmith/archive/2007/07/29/accessing-session-from-an-httphandler.aspx"><P><STRONG>context.Session["foo"] = "bar";</STRONG> </P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://aspadvice.com/blogs/ssmith/archive/2007/07/29/accessing-session-from-an-httphandler.aspx">and I encountered a <STRONG>NullReferenceException</STRONG>. </blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://aspadvice.com/blogs/ssmith/archive/2007/07/29/accessing-session-from-an-httphandler.aspx">in order to access Session from an HttpHandler you need to add a marker interface (meaning an interface with no implementation requirements) to your HttpHandler class. </blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://aspadvice.com/blogs/ssmith/archive/2007/07/29/accessing-session-from-an-httphandler.aspx"><P>There are in fact several options you can choose from, and it's best for performance reasons if you limit your selection to only what is needed. The marker interfaces are found in the <A href="http://msdn2.microsoft.com/en-us/library/system.web.sessionstate(vs.80).aspx">System.Web.SessionState</A> namespace, and include the following:</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://aspadvice.com/blogs/ssmith/archive/2007/07/29/accessing-session-from-an-httphandler.aspx"><P><STRONG><A href="http://msdn2.microsoft.com/en-us/library/system.web.sessionstate.irequiressessionstate(VS.80).aspx">IRequiresSessionState</A></STRONG> - Specifies the HTTP handler requires both read and write access to session state values.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://aspadvice.com/blogs/ssmith/archive/2007/07/29/accessing-session-from-an-httphandler.aspx"><P><STRONG><A href="http://msdn2.microsoft.com/en-us/library/system.web.sessionstate.ireadonlysessionstate(VS.80).aspx">IReadOnlySessionState</A></STRONG> - Specifies the HTTP handler requires only read access to session state values.</P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;"> </td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/172DF021-80C0-48C9-B900-665C9D70F080/blog/" title="blog or email this clip"><img src="http://content6.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>
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